Very nice ...
@graveolens
in reply to @jamestanton
Show in a regular heptagon of side length 1 there are two diagonal of lengths a and b that satisfy 1/a + 1/b = 1.pic.twitter.com/Q2GMpDoInK
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The citation is /Golden Fields: A Case for the Heptagon/ by P. Steinbach, but I can't find an open access version.